Everyone relax! There's no harem. There is a main couple, and they love each other deeply, even would die for each other. Neither of them stray from the relationship. Not sure what the previous reviewer was focused on, but considering they dropped it early, just ignore it. The MC does have an identical brother who is also in a relationship. But, there's no partner swapping. There are also other female characters in the series (this is normal!), but they don't stand a chance. Season 2 is very good, and I'm looking forward to the continuation in next season. Watch without worry!