
I see that there is a love triangle, but is it painful to read ? I don't like when it's too angsty

depends what you mean by painful?
so far its not full-blown angst, its more of a... tense situation? Where you know theres these threads and traps of relationships and problems, and that something is going to make them go off. There's probably going to be some stuff about unrequited love and being hurt in the past, but its quite hard to tell with only 18 (raw) chapters... webtoons like this one tend to be 60 or more chapters, so we're not even a third of the way through. That being said, likeliness of angst is like 70% in the future.
and its definitely not fluff - the author's other series Fools is much more fluff (with a few touching/sad moments) if that's what ur looking for, tho Fools is practically PG
hope this was helpful
The pace is sometimes hasty, and dialogues messy, but i still like this manga, the characters truly are endearing... maybe a little sad ? I hope it will be more cheerful the next chapters