Chin was really not having a great day. First, he receives a call to head into 5-0 headquarters urgently. Obviously he hurried there on his bike, thinking that there was a homicide or a kidnapping, but no.
Steve was there introducing everyone to Agent Anya Marsden, a transfer from CSIS, the canadian intelligence. The governor had decided that they needed a more international edge on 5-0, so she was called in.
Chin was not the type of person to underestimate someone based on their size, but this girl was maybe 5'5 and 130 pounds. To top that off, all she did was shake his hand and go "Agent Marsden, pleasure." With a sniff and a bit of a haughty look. And...he never got a chance to say anything before they were called to investigate the disappearance of a Major League Baseball player on vacation.

And that is how Chin and Steve found themselves tied to chairs in what was supposed to be an abandoned house. They'd walked into a room, which locked behind them before the room filled up with gas. They woke up tied to chairs, with none other than Jim Brown (the baseball player) holding them hostage.

"You're 5-0 right?" He asked. "5-0 came to find me, but they won't, they won't!"

"Brah, listen. We came to help you, are you feeling alright?" Chin asked, trying to negotiate with crazed gun-wielding man.

"Yeah, just tell us what you need and we can help you." Steve joined in.

"What I need. What I need!" He yelled, pointing the gun at them. "I need...to get away. Can you get me away?"

Steve began to negotiate with the Jim, while Chin looked for a way out. He didn't see anyway that this would end well if they stayed tied up like this. He happened to glance up at the level above the stairwell, and what he saw almost caused a heart attack.
Army crawling her way across the floor towards the railing, was Agent Anya Marsden. Chin tried to wave her off, there was no way she could take down this athlete. However, he inadvertently alerted Jim to her position.

"Hey, what are you looking at?" Jim asked.

Just as he began to turn around, Anya launched herself onto the railing, sliding down it quicker than Jim could process. She launched herself at him in one move, and kicked the gun out of his hand. Jim launched out his hand to punch, but she wrapped her arms around it and used the force to propel herself upwards. Her legs wrapped around his neck and she brought him down. She stayed there until he stopped moving, before standing up and brushing herself off.

"You boys alright?" She asked, cutting their ropes with a purple switchblade she's had in her pocket.

"We're fine, thanks." Chin said, obviously still shocked.

"Thanks, Agent Marsden." Steve said graciously.

"Please Commander, call me Anya. We are on a team now." She smiled a warm smile at him.

Two hours later at HQ, Chin finally worked up the courage to go talk to her. He approached her with a smile, while she was working on her laptop in her empty office.

"Look, Agent Marsden..." He began.

"Anya."

"Yes, Anya. I'm sorry for underestimating you, it's just that..."

"Just that I'm small, and thin, and a girl. I don't blame you, but I'm glad we were both corrected on our first impressions." She smiled at him.

"Me too, wait. What did you think about me?" He asked.

She stood up and left the room, turning just as she left the doorway. "You do know how to smile. It's an improvement." And she left.

And somehow, form that somewhat unclear comment, Chin knew one thing.

Him and Anya Marsden were going to get along just fine.