Four years have passed since the Fire Kingdom incident. During those years, Finn decided to focus on improving his swordsman skills with Rattleballs on a daily basis. He also exercised regularly which included running and weightlifting. His mindset was clear, as Ooo's champion he needed to make sure he was combat ready in top, physical condition. Once he finished his rigorous training, Finn periodically patrolled all of Ooo's kingdoms except for the Fire Kingdom. He reasoned with himself that there was no need because its champion Cinnamon Bun had it covered. Other than that, Finn spent his spare time completing side quests for Bubblegum which usually involved collecting anything scientifically significant to helping out the general public.
There were a couple of notable events that took place within those four years. In the first year, the first highlight involved Simon temporarily reuniting with Marceline and Betty Grof after the wizard monster Bella Noche took away Ice King's powers. Unfortunately, after Bella Noche was defeated by Betty, Ice King's powers and influence returned the to the crown, therefore dominating Simon's mind once again. To this day, Betty continues her search for a cure to free her lover's mind from the dreaded Ice crown.
Another event that took place in the first year involved the people's welfare of the Lemongrab Kingdom. Possibly after a couple weeks, Lemonhope decided to repay his debts by freeing his people from his kingdom's totalitarian regime. By using his harp, Lemonhope was able to destroy Earl of Lemongrab and free Lemongrab 2 along with all the other people who were consumed from Earl. Although peace and happiness were restored in the kingdom, Lemonhope decided to pursue his own agenda of personal freedom instead of supervising his kingdom's restoration. He would never return to his kingdom again for many decades until he reached an elderly age.
Between the first two years, Finn kept himself preoccupied by dungeon crawling and hanging out with his friends. But as the days ended, Finn found himself restless in his thoughts regarding the Fire Kingdom incident. He knew that he couldn't just leave the dreaded memory behind unless he reached a proper closure with FP. He promised himself he would see her again one day and apologize for his actions. The problem was that he didn't feel like he was ready for confrontation, yet. Eventually, Finn was able to temporarily cope with his feelings by either training overnight or by going on jam sessions with Marceline.
On the third year, Finn was continuing his daily training to become a better protector for Ooo. He learned from his private studies that to be an ideal hero, one must humble themselves from their personal needs. As a result, he pledged that he would put his personal love life and interests on hold and focus more on ensuring Ooo's safety. His demonstration of self-sacrifice would ensure the people his commitment to protecting them at all costs. Although there were times when Finn felt like his services were taken for granted, he continued to work as Ooo's champion. He suspected that his duty as a protector would be unappreciated at times, yet he would continue to stay because he knew no one else would protect the weak and disadvantaged. As time passed by, Finn's demeanor became more reserved and serious. He would occasionally smile at everyone but would usually keep a stoic expression. Overall, Finn began acting more formal, while his goofy personality became less apparent.
Near the end of the third year, Jake mustered enough courage to finally propose to his girlfriend Lady Rainicorn. He knew marriage was a big step in relationships, but he decided to accept the responsibilities and challenges it had to offer. He also knew that he would be living with Lady and his family for most of his life. However, at the time, Finn encouraged him that he was old enough to look out for himself so Jake wouldn't feel worried. After Lady accepted the proposal, the wedding took place at the Candy Kingdom (and no one was arrested this time).
As the celebration commenced, Finn approached his brother and gave him a hug. "Hey, congrats Jake! You finally did it!"
"Yeah, thanks. I sure did! I'm going to miss you though," Jake's smile slightly faltered.
"It's alright Jake, I've been able to handle myself for a while now so it's no big deal. Besides, we can always call each other and visit each other down the road."
"You're right, Finn. I suppose we could do that," Jake cheered up again. The two hugged and patted each other's backs one more time. Then Finn broke the hug and spoke in a dramatic heroic voice, "Now, go home and be a family man!"
"Haha, I got the reference. I will Finn. Take care of yourself," Jake said as he went back to Rainicorn's side. Overall, the wedding party was spectacular and there were no accidents caused by LSP.
On the fourth year, Finn found himself standing on one of the tallest rooftops overlooking the city of the Candy Kingdom. Being at 19 years of age, Finn was approximately standing 5'11" weighing about 170 pounds. His physical build was lean and muscular. His muscles weren't excessively bulky, but his overall appearance suggested he wasn't someone that could be trifled with so easily. His attire consisted of a dark navy hooded cloak complete with a grey balaclava that covers his face from the nose down. Underneath his cloak, he wore the same short sleeved, sky blue shirt and a pair of dark blue pants. He also wore two black pairs of ballistic paddings to cover his elbows along with his knees. Lastly, Finn wore the same kind of shoes and backpack except for his bear hat. He thought to himself it just made him look silly now that he was older. As a result, Finn decided to leave it inside his back pack for safe keeping.
As Finn overlooked the evening streets of the Candy Kingdom, he closed his eyes for a brief moment, reflecting on his past. He wondered at times what his future would have been like if he never made the decisions that lead to his separation with Flame Princess. But then again, he supposed that it was for the best, knowing that her responsibilities as a monarch would keep her busy. Because of her leadership, Finn knew that the Candy Kingdom would not have to worry about the Fire Kingdom being a threat. However, relations between the two kingdoms currently remained uncertain. Flame Princess distrusted Bubblegum's motives for her obsession with science. Nonetheless, the kingdoms maintained an open line of communications.
Suddenly, Finn was pulled out of his thoughts when he received a distress call from his phone. He answered quickly, "Yes, Bubblegum... Alright I'm on my way. Over and out." Finn placed his phone back into his pocket and glanced at the horizon one more time. Then, he donned his hood and mask and dashed towards the Candy Kingdom palace.