BUT BRO WHY DO I FEEL THAT KIM EUIHUYN WILL FALL IN LOVE WITH THE NEIGHBOR AND THEN TAEJOO WILL BECOME THE SIDE CHARACTER HERE......
IT WILL GIVE ME A (Yours To Claim) VIBE 
(Everything that I said here is my theory based on what I saw from the trailer, so don't take my words seriously.)
Please how dare you to say this 
i- if you read the trailer already u should know what happen 💀 he gon die anyway its not gonna be yours to claim lol. its not even a love triangle to start with-
@Yazuku
I'M SORRY BUT I HAD TO SAY IT 
@scar
I'm not sure if the guy who was fighting with Taejoo was the neighbour, maybe it was that ugly guy who got his head smashed by Euihuyn.
In any case, the source of the neighbor's death was also a theory by a fan, so it is not certain yet
But I also feel like he's going to die in the end, and I also feel like this manhwa won't have a happy ending or a satisfying ending for us. 