I Was Reborn as a Background Character and Accidentally Became Everyone's Crush

[Two male leads + everyone’s favorite + cultivation + love rivals everywhere + powerful leads + fragmented attack]

Fu Fei dies unexpectedly, then accidentally binds himself to an inconspicuous System. The role he has to play is just as insignificant.

So, after transmigrating, Fu Fei spends his days eating, sleeping, and snacking in the melon field, doing as little as possible. He only needs to make a brief appearance at the crucial moment to bow out perfectly.

But!

Can someone explain why the protagonist, the villain, the supporting characters, the cannon fodder, and even every passerby, A, B, and C, are all fighting over him!??

①

From the start, the System leaves him with one instruction: “Protect the sickly crown prince,” then vanishes without a trace.

Fu Fei knows nothing about the crown prince, so all he can do is muddle through his daily work.

Then he accidentally falls into a secret realm and is forced into a wedding. His wedding partner is none other than the mission target he has been searching for so long: the badly wounded crown prince of the Demon Realm.

After they meet, Fu Fei diligently plays the supporting role, but everyone blames the crown prince of the Demon Realm for forcing him into it.

Then, out of nowhere, along come the crown prince of the Heavenly Realm, gravely injured after undergoing tribulation; the crown prince of the merfolk, down on his luck and poisoned; the crown prince of the Underworld, amnesiac and blind; and the crown prince of the Phoenix Clan, disabled and missing an arm.

Fu Fei: …Help! What do I do after accidentally stumbling into a whole nest of crown princes?

[Note: The protagonist is a clueless heartthrob, so he has no feelings. Expect shameless, over-the-top melodrama.]