*SPOILERS ALERT* One of the best ways to know that one main lead is falling for the other in a K-drama is when the former shows off their jealous side. In It's Okay to Not Be Okay Ep 8, we saw Moon Gang-tae (Kim Soo-hyun) getting frustrated beyond belief when a fan (cameo by Choi Daniel) gets handsy with Ko Mun-yeong (Seo Ye-ji) under the pretense of having a fanboy moment with her.