The Moonlight's Survival Guide [System]

[You are the moonlight in his heart, the cinnabar mark in his heart. You are the greatest regret of his life, the one and only thing he regrets in this lifetime.] Shi Yuan: "…" Suffering from a serious illness, Shi Yuan made a contract with the System to survive, traveling between many different worlds. And so- He became the best master in the Demon Lord's heart; He became the childhood friend the CEO cared about most when he was poor; He became the only rival the leader of the martial arts alliance considered his equal; He became... He earned the deepest trust of others. And then, he died. Just like that, he became the moonlight in everyone's heart, the cinnabar mark in everyone's heart. After finally returning to his own world, Shi Yuan thought he could recover his health and live a normal life. But he never expected... Those powerful figures had come to his world! And every one of them had turned into a lunatic! "You remind me of my master." "A Yuan, is that you?" "I once had a rival who looked exactly like you." Shi Yuan fell silent: "…Sorry, you've all mistaken me for someone else."