
Do i need to read the main pearl boy before reading this one?

You don’t need to. Seunghyun is a side character and they don’t really mention his past there. The few mentions of him are that he works with the guy getting married and that we see he’s in love with him. That’s it tho. Side 20: S1 finale is the only one that gives any slight mention in connection to this worth reading (it’s really just the day of the wedding when Seunghyun’s getting ready for it).
Fuckass ML