Poor MaRo was treated badly. This brave boy sought revenge for his arbitrarily destroyed life.
In the end, the evil was done, a mild punishment was meted out to the main criminals, but the most destructive of all was the attractive MaRo himself.

That the love of the main characters ends tragically was known since EunGi, whom MaRo loved, had sexual intercourse with the dubious lawyer Park. This consistently and irreparably destroyed the whole love story. Why, was there no other option for their difficult love that cost us a lot of nerves and hopes?

In the end, we are left with a bunch of loose ends, a presumably dead MaRo, EunGi who might be with one of her cheaters. Yes one could make free-floating guesses. Very unsatisfying, downright annoying the whole thing.

There was a consolation for us sensitive souls in a quasi-separate final chapter. In an obviously fictional story, the lovers found themselves in a kind of modern-day Xanadu. A village by the sea, bathed in pastel colors, it was the place of their longing.
MaRo, who had lost his memory, and EunGi seemed strangely empty. His voiceover described that he would find EunGi again in his next life and live his happiness with her.

Everyone should think what they want, the writers probably think. Don't get angry friends, and peace on earth!