At My Ex's Wedding, I Sang a Song Called Guest

[Healing + entertainment + System + not much angst] A young man sits in his room, staring at the message on his phone…and falls into deep thought… “On September 7, I hope you can come to my wedding…” Chen Luo: “Thanks so much for the very special invitation to witness your love…” Then a video of him singing at his ex’s wedding was unexpectedly posted online, and suddenly went viral… After that, every song Chen Luo released was tinged with sadness, setting him on an emo path through life… People called him the Emo Prince. His song “Nothing to Do with Me” showed people that the person who once said she loved him had nothing to do with the person he was now. His song “Piece Together the Memories for You” showed people that the most wonderful version of her lived only in their memories… His song “Letting Go” showed people that memories belong only in an envelope. His song “Under the Sea” showed people that the endless seabed was like the rumors flying all over the sky. His song “Call of Silence” from Attack on Titan showed people what true freedom really was… [The synopsis doesn’t do it justice, so please give the story a try! And the author is very open to suggestions!!]