I Want to Take Home the Demon Emperor Who Killed Me Twice.

[Slightly straight male protagonist + cold female devil + cold + system + time travel + little invincible + fantasy + daily life + master and apprentice + no harem] My name is Wang Hao. I have just finished my summer job and am ready to finish my college life happily. But, when I was crossing the road, I seemed to be somewhere else... I was inexplicably bound to a system that told me to assassinate one person and I could go home and have endless wealth... It obviously sounded false, but I still believed it... (Ten thousand years after trying to assassinate...) Okay, I admit that this person named Jiang Hanyu has some strength, and I also admit that I am bound to a second-hand system. Who are you scolding? (◦`~´◦)] [I'm scolding you, you second-rate system! Although, this woman named Jiang Hanyu does have some strength. But unfortunately, I am a sixth-year old and managed to poison him to death. But seeing her weak, painful and fragile look, I actually wanted to cry a little bit... My divine sea was blocked by the system, causing me to be unable to remember some things in the past. I naturally became an ordinary villager. But by accident, I saw a familiar figure...