I don't agree with what Heewon(ML) is doing but from what I gather he is doing exposure therapy... Though going through a "play session" he is actually trying to help Wookyung(MC) over come his fears and help him... Wookyung keeps saying he's fine and all is good.. But our masochistic baby boy is far from fine as he keeps seeing, feeling and reliving what happened through the trama he had from back then!!! This is what I am thinking, anyways!! Though heart breaking to see as someone who has ptsd!! I feel for Wookyung so much 😢❤