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It's a side, because author di-ed before they could finish this manhwa. Someone else is working on this manhwa right now, and that's why we have a side. They could name this a season 2 of the manhwa, but they want to honor the og author. Hence why we have a side, rather then a season 2.
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If you read chapter 1 of the official release, at the end of the chapter, you will see a sentence that reads "This work is dedicated to the author of the original work, the late Dugo". And the person who let us know that Dugo passed away was their best friend, I think. I don't quite remember who it was exactly. It was shown at the comment section of the manhwa app. I'm not sure which one it was tho (Tapaz, or maybe the other one).
Because of the trauma, in his subconscious mind, Haru still lives like he's a young guy like before his parents first died. But he has always been a mature boy, hence why people don't see anything wrong with him. And him avoiding therapy really doesn't help himself.
Nonetheless, super lovers is one of my favorite yaoi of all time. It makes me feel like going on a complicated adventure each time I grow older. My perspective of love changes every few years that i grew, along with my perspective of their relationship. But I love them, still.