Because that story is from 2005. At the time, this was one of the first manhwa that made it through in the scene were mostly only mangas were being translated. And it fully changed the game.
None of the dynamics were the stereotypically known by the fan. The story was way different than anything that was shown, and the standards of quality was very different. This made this piece stand out, and also, created a very STRONG fanbase. There is a very clear pattern of an older generation of fushioji for which this manhwa was THE one. On mangago, once it was finally added it stayed the most read and popular work for months as well.
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I didn't like the double standards of the seme. He is extremely controlling and possessive when it comes the the uke and blows up over the smallest things, saying he's gonna punish the uke, lock him up in a cage, hurt his friends etc. But when he himself continuously slept with his "father" and LIED about it to the uke's face, the uke never got even an apology.