Responses

He likes the guy and he really wanted to tell him but he can only think that. When he tries to say, the words don't come out. So he kissed him in desperation. After the kiss, he was able to say it whereas the other guy is not able to respond and has an F on his tongue. That's how he realizes about the switch.
When he kiss someone, do they exchange their ability or does Jinsol only pass his ? Cause I don't understand how he could say I like you after kissing this guy cause basically he can only tell the truth after the kiss, right ?