looking for a bl manhua

It’s a sci-fi type and the Mc is a doctor, the ML is a robot I think and he is like an assassin or smnt. Mc has brown hair and ML has blonde hair. I think they knew each other when they were younger, and at one point ML protects MC. I’m sorry this isn’t enough info I read it like a year or two ago and I don’t remember the name of it. I’m pretty sure it is a chinese manhua but I could be wrong. One distinctive thing about the art style is the eyes, they are very pretty and detailed. And there was also butterfly symbolism. pls help me!!