The Passerby Saves the Tragic Male Side Character [Quick Transmigration]

Bai Yuan pulls an all-nighter and dies suddenly. As his soul leaves his body, he's chosen by the System and becomes an inexperienced Host. To stay alive, he has no choice but to become a minor side character and embark on the point of no return: saving the male supporting characters in angsty romance novels.

World One:

[In a rural village in the 1970s, the original bottom and top go through a series of heartbreaking romances before legally marrying as a same-sex couple. Their married life is full of friction. One day, the original bottom storms out in a huff and walks straight into the path of a truck. Just as the truck brakes hard, someone shoves him out of the way. The original top's older brother, a supporting character who has secretly loved him for years, dies on the spot, killed in the accident.]

Bai Yuan: ...There's no saving someone who's blinded by love.

Later, Bai Yuan moves into the first multistory house in the village. Whenever he goes out, his man helps him get dressed; when he comes home, there's a hot meal waiting. Bai Yuan glances at the handsome man asleep with his face tucked into Bai Yuan's neck.

Bai Yuan: Being love-struck... feels good. Really good.

World Two:

[In an ABO setting, the original bottom is a top-tier Omega who falls in love with the original top, a Beta. After a physically and emotionally agonizing relationship, they finally decide to defy their genes and marry. When the original bottom begins researching a differentiation surgery to satisfy his needs, the supporting character, a top-tier Alpha, is framed and turned into a test subject. He eventually dies because he cannot be cured.]

Bai Yuan: ...This one's even more of a heavyweight.

After differentiating into a Bate, Bai Yuan has just opened the door when he sees the handsome man, an Alpha in heat, clinging to Bai Yuan's clothes and holding back tears.

Bai Yuan: ...The more you cry, the more excited I get.

World Three:

[In a fictional dynasty, the original bottom is a talented general who makes a name for himself in a single battle. He falls in love with the original top, the leader of a rebel army from an enemy state. After suffering heartbreak and physical pain, the two finally decide to retire to the mountains and spend the rest of their lives together. But the frontier is in crisis, and the enemy state invades again. For the sake of his country, the original bottom returns to the battlefield. After winning a decisive victory, he is ordered by the reigning emperor to commit suicide. A civil servant, a remnant of the previous dynasty who has spent years undercover in the capital, exposes himself to save the original bottom. He ends up drinking a cup of poison and dying in prison.]

Bai Yuan: ...Unfit for the task, and a wretched little man.

System: This time, you're the emperor.

Bai Yuan: ...

Later, Emperor Bai Yuan, so incompetent that reading memorials leaves him dizzy, glances at the little official he forcibly "married," then at the warm ginseng tea the other man has somehow placed before him.

Bai Yuan: ...I'd happily drink this even if it were poisoned.

World Four: [Legitimate son bottom x concubine-born son top, grand household]

World Five.

A serious, hardworking bottom who loves to crack jokes x a pure-hearted, love-struck top with a calculating mind and multiple fragments

Content warnings:

1. All settings are fictional.

2. In every world, the original bottom has some degree of regret and face-slapping. Mildly melodramatic.

3. I'll add more warnings if I think of any.

Theme: None