He actually is .. she is pretending but he is 100 percent into her : look at how territorial he is around any guy he things is interested in her ! From the first episode he has been into her like hard which is why he is investigating to have access …
Did you see their kiss ? Actually the notion of him liking her is weird … his character is heavy red flag just look at the way he is courting her … now Jung Hyun is red flag too but his gaze gets their interaction is few but more intense
But there’s now why I see him as a red flag …