Responses
You're right. He is handling everything in such a mature and sensible manner when it comes down to it. Yes, there are a couple of misunderstandings on his part (him thinking that the lipstick was from a girlfriend and also thinking that Ah-Juicy can't possibly like him, even though he has admitted to himself that he is developing feelings for Ah-Juicy), but he isn't panicking over them. He is simply trying to do what he thinks is best. He is TRULY a great character and deserves his "happily ever after" with Ah-Juicy.
I think we don't talk abt eui joons maturity enough. the way he handled that jackass who was trying to play him was so badass, and also helped him heal and move on from his long time crush. he's not portrayed as some naive delicate flower boy who is head over heels for the ml, and I completely understand his decision to sleep with aHjUiCy for the last time. he doesn't want a continuous cycle of one sided crushes on people who will never settle for him (at least that's how the ml has been presented up until now where he revealed his feelings). eui joon is protecting himself as he knows nothing good will come out of a sexual relationship where he's, once again, crushing silently. I really respect his choice and I think it was the best one to make. this can help further propel their relationship into one with true feelings, and also give eui joon time to heal from his previous problems, bc if we're being real here, another empty relationship can't help solve the emotional and physicially issues you struggle with. I'm so glad we get to see his development as his own individual without the reliance of romance to display his growth.