Obsessive Love (madness) (YAOI & SHOUNEN-AI)

He does act like a lunatic. Sorry. He is one. It is one of the first manhwas to show the destructive nature of obsessive love and the manhwa hasn't tried to romanticize his craziness or forgive the consequences (at least as of yet.)
It shows what happens when you get a lunatic and powerful one, with no regard for the lives of others, at that take a liking to you.

**Updated
It is romanticising his craziness.

the singer loves the soccer player with the tragic past, to the point of madness and can't live without him. I have never seen any seme so poetic and dark about their obsessive love. Koji lives up to his job as a poet and singer with so many (dark) emotions regarding Izumi.

Don't get fooled by the manhwa's flufiness, comedy and cutesy characters. The main lead is one fine piece of two-faced manipulative seme.

I even struggled with putting this manga whether in this list or the puppy version of obsessive love list.

since I can't express love, I'll express it in other ways to keep you

the seme becomes obsessed with his beautiful and reserved doctor, and will go to any length to keep him

last story. seme is very much of an immature child

ch.2. amazing how Kuneida Saika built up the tension.

haven't read this one, but I heard from many reviewers that this manhwa has an obsessive main character

my first BL. I love and hate how Dai loves Jaehee. I would usually bark and no bite about how this person is cruel and evil, and then a few days later read a manga with similar character doing same actions with us, readers, seeing little to no real consequences of those actions.
But this one was different as it actually shows the consequences of those characters' obsessiveness I read for guilty pleasure.

this mangaka is seriously good at building up the tension and the expressions the characters make are to applaud