Finished. Just my takes

I actually love this, but the romance and the epilogue where his son will inherit the power is kinda meh. It would be interesting if the epilogue tackled just a small glimpse of how the Mc's life works. Not too detailed, but to achieve a mysterious ending and let the viewer's mind work and imagine how it's going to be.

The romance is kind of forced. Because the interactions between them are so brief, and the mc has no affections for Hae-in at that moments and then one second she admitted that she likes him, and the MC was like, "Woah, I should like her because she likes me." The rest is history.