Ji-hwan told seol a that "If there's something that you really want. You have to be very careful when you're getting a feel for it." And then he continues by saying that there is butterfly on a flower. It's like he's telling seola to catch it while she has the oppurtunity.

Ji hwan obviously knows what's up the fact that after he remembered the seol-a leaning on the back of norae after remembering the no rae seen with boyfriend kissing. He's putting the two scenarios under the same category which is no-rae being in love with someone else while he watches from a distance.

Aaaah im squeeling from the handholding. So lewd seol a. So lewd