This must be one of the best Kdramas I've seen in a while. The plot itself is interesting and keeps you at the edge of your seat, not to mention the blooming romance between Cha Min and Go Se-Yeon.
The chemistry between them is to die for (literally) and they are incredibly cute together. I really loved Dong-Cheol and he was a sweetheart, glad to see him get together with Mi-Do, the happiness they deserved.
The plot really kept going and plot twists that I didn't see coming. The drama kept increasing towards the last episode, which was expected. I was happy it was happy ending for all.
I only wished they explained the power of Abyss more , and its background, and how Min was resurrected, but I guess I was too happy to know he got back alive with Se-Yeon that it didn't matter to me.
They could have also resurrected Hee-Jin's mother which was a bummer. Other than that, fantastic series, easy to bingewatch and totally worth it!