Gyeong's Story
Gyeong Joon was born in a Galactic Universe far from planet Earth. He was born 1995 in a Galactic version of North Korea raised by his parents and 1 sister but eventually his parents were killed for unknown reason so now he has been taken by one the Galactic North Korean Officers along with his little sister Hana Myeong. They've struggle a lot in prison until one day He got a call from a superior Kwan Moon making a deal with Gyeong in order to save his sister and also leads his father's footstep. Taking place after the finale I.N.T.E.R.V.I.E.W, When Numbuh 1 place his into a Cannon which destroying earth. Gyeong on the other hand captured his ex-girlfriend Lizzie Devine (Numbuh Vine) to get information out of her along with Numbuh 274. He then tells her that their precious Earth is going to be destroyed thanks to Nigel Uno and she was pretty shocked about it but Chad tries to stop him by not doing so and this is not what the Kids Next Door is all about. The two were going to be executed until one of Operatives crashing in and save Lizzie and Chad on time to escape.
Crossover
On the day after Nigel destroyed Earth, Gyeong was ease dropping on the conversation at the meeting where one of the Galactic commanders giving Numbuh 1 an assignment to track down Steven Universe because their "Birth" place is not like any other planet. So he interfere their conversation and ask if he join Nigel on his quest and they agreed. Before they landed there, Gyeong somehow manage to hack Nigel's ship and send crashing into Steven's home planet leads him unconscious. As soon as he woke up, he saw this place beautiful until he was caught by The Clusters but saved by Steven and the Crystal Gems but once again he is knock out. He then woke up in Steven's room trying to Interrogating him but he is still to week after by what happen. Meanwhile Gyeong on the other hand, landed on Steven's planet to contact General Moon that he did his Job but technically his Scouter is showing that Nigel is still alive and Moon is very eager about it So he wants Gyeong to finish him off permanently, Until he saw weird creatures called The "Clusters" and their leader Peridot and she also the leader of The "Homeland Gems" so he had to fight his way through but was no match for them. The Clusters were going to eliminated him but Gyeong Intervene by telling Peridot that she or her troops ever Numbuh 1 and him what he looks like on his Scouter and she also wants to destroy Steven as well. So the two made a deal to hunt down both Inmates together. Sooner or later, They finally found them but Gyeong was double cross by her which makes him an inmate too. Nigel convicted Gyeong to work together in order to save themselves and Steven by the Homeland Gems. Once they made a plan, Gyeong call reinforcements to arrive less than 10 minutes to get here. It was a war at Steven's homeland but in the end they manage to escape but failed their mission.
The Final Fate
In the Series Finale, Gyeong has failed his mission which leads him locking up to prison again. So he had no choice but to fight off Nigel in the arena in order to save his sister, but created a diversion to ecsape the arena from Numbuh Infinity's Evil plans. The two found what they been looking for but suddenly a trap came by and got Gyeong having multiple Shocking's So Gyeong Had to sacrifice himself to save Nigel by getting out of the control room by using a light bomb. At his final moments, Gyeong told Numbuh 1 to promise to look out his Hana for him.