But am I bisexual tho?

Most bisexual ppl like both genders but has a preference for a specific gender. Some ppl are into both but prefer the same gender while others prefer the opposite gender. Some ppl are both romantically and sexually attracted to both gender while others might be romantically attracted to one gender and sexually attracted to another

Thank you for the clarification ^_^ it's very well said. What i meant with my comment was that if anyone thought they were strictly attracted to 1 gender, this is so well drawn that it might change their mind ٩(๑❛ᴗ❛๑)۶

If we were to talk about both characters in the manhwa, I highly doubt either of them are bisexual. It seems like when they switched bodies, it was only natural to have these reactions from both ends. I highly doubt the dude would even let serin switch bodies again let alone peg him, even if it felt good