I like how the more MC mingles around with ML, the more blackened he becomes. Like, "If you dare hurt my beloved husband then you need to die!" kind. He probably doesn't realize that though uwu

No joke, pretty sure the ML is certifiable, but 1200 years sleeping next to the corpse of your beloved in an underground palace makes this understandable (plus, a gruesome, tragic backstory doesn't help).

One reason why he's so accepting of everything is that he comes from a loveless family, with only his grandmother having a proper relationship with him before she died. So, getting a handsome, doting husband and a palace full of riches seemed like a good deal to him, who is pretty unlucky with love. However, I didn't see the twist with the MC's true origins coming. MAJOR SPOILER--if you plan on reading this series, refrain from spoiling yourself since this spoiler is revealed in chapters 20-21.

He's a prior transmigrator with a system and everything (think Shen Yuan/Shen Qingqiu from s*um Villain Self Saving System but with time travel instead of being sent into another world--or at least that's how it's being played out; we still don't know the full story--) turned reincarnator of sorts-he dies and reincarnates back into the body he had previously transmigrated into.

left the tomb to live in the modern era,

My dear fellow readers who commented with those vibes I'm sure you're all lovely people but you've all got me worried..... The first few chaps in question might be a bit hot or steamy but they were about as far from romantic as you can get. I might feel safe knowing this crazy ML is confined to the boundaries of the story but the mental shock of seeing modern people I could be meeting every day fawning over the ml's horrifying actions followed me the entire time I binged this story.

The way he feared MC’s memories coming back and the way he acted I thought MC hated and abandoned him. Like some deep “I could never love you”. MC stayed with him the entire time and was mostly accepting.

His death was an injury gained saving ML. He didn’t immediately die but grew weaker with time. The period I thought they were separated, MC was actually sick in bed at ML’s house. After the injury ML became unhinged because turning your back on him was one thing but MC was forsaken as well leading to neither receiving care or help. ML goes on a killing spring for revenge. MC disapproved because it wasn’t revenge anymore but mass mu*der. He develops a bit of fear towards ML as he witnesses his descent into depravity. MC never acted on it though. He couldn’t. He was on his death bed. Anyway, ML believes MC gave his the immortality elixir to punish him, but MC was gonna die no matter what from failing the mission task and that’s why he made ML drink it. He died before he could explain.

that the MC actually was part of a transmigration system. At some point in the past, he transmigrated into the original body and the person the ML fell in love with all those years ago was actually the MC. The original owner of the body and the MC are actually two different people, not reincarnations of the same soul. However, the MC has lost these memories due to failing his task and dying. This is a bit confusing and I didn't actually understand what was going on until the MC basically spelled it out for the readers, haha.

MC is basically useless in all the situations despite transmigrating as the ML's shixiong and idol who literally taught the ML everything ??? Lol

I hope as the story progresses ML redeems himself and shows that he has changed, but was already very put off by the non-consensual stuff that happened prior to MC awakening. Again, why do most BL novels have to involve non-consent?? ? It's not cute and isn't romantic. At ch 21 the story has revealed to be a transmigration plot - which is a genre I'm typically not interested in (which is probably silly because I'm fine with reincarnation plots, but hey, we like what we like). I'm a little surprised, but will keep reading for now to see where it goes.