
I just wanna know if ML ever remembers his past life.

Spoiler...
1) Nahan (the "vengance" guy), who eventually puts ML under the same hypnosis he already showed (the worst nightmare a person can imagine). Yuder saw the night he killed ML, and ML sees the same night but doesn't understand what's going on obviously, thus proving that however Yuder came back to the past, ML was also connected.
2) Later on ML starts to see fragments of his past through dreams, as it is explained how ML and Yuder had imprinted in their first life via alpha-omega (kinda destined pair?), a bond that was revitalized by being together in this life. He doesn't get his full memories, but he does remember why he did what he did in his past life, specially the cruelty he showed towards Yuder in many desicions.
Someone burn that insult on mothers alive.