The Backbender (Avatar: The Last Airbender) - Chapter 24 - : Acceptance.

Growing up in a place where the rule of the jungle is law, the simple yet cunning Shaar is thrown into the chaotic world of war and political turbulence. After a chance meeting with a mysterious young girl, his destiny is forever changed as he embarks on a journey, joining the Byzantine army and climbing its ranks. With his bizarre beauty standards, will he ever return the affection of the girls that will follow him? Will he ever learn about his real parents? What lies ahead of him is a journey of strange humor and adventure.

There is always such a person in the world who likes to take their ex/Bai Yueguang/best friend as a stepping stone for their love.
These exes/Bai Yueguang/Girlfriends are called female supporting roles. They obviously did nothing. Just because they were involved with the male and female protagonists, they were trampled on, hurt, and even left a shadow that will never go away for a lifetime.
Jiang centrifugally felt sorry for those innocent girls, so he traveled from one world to another to help them cross that hurdle.
However, after a certain world, the mission is obviously wrong.
Jiang Li: “I will treat you well.”
“It’s not enough.” The girl imprisoned Jiang Li in her arms, breathing warmly: “Don’t leave, you must always be good to me, only to me.”
Jiang Li: ? ? ?
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Finely divided slice attack x natural sweet and soft feeling
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World One: Campus
The taciturn facial paralyzed “bad girl” x the rich lady who is cold on the outside and hot on the inside
World II: Cultivation
Swordsmith x Sword Spirit

World Three: The World of Beasts
Orc Princess x Totem (Big Cat x Little Rabbit)
World Four: Game of Death abo
Tsundere Big Brother x Super Rookie (Double O)

World Five: Spirituality
Ghost King x Rookie Celestial Master
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Edible guide:
#1v1 Unshakable
#Su Shuangwen, everything is for Su Shuang
#gongjing is divided into slices, being indifferent to others, sweet and soft to attacking

Content tags: system sweet text fast wear cool text
Search keywords: protagonist: Jiang Li ┃ supporting role: a lot ┃ others: fast wear, system, sweet text, mutual favor
One sentence introduction: you are sweet

- Description from novelbuddy

Lin Yu finds himself transported to the world of Honkai: Star Rail.Equipped with a divine mobile game development system, his first project is creating “Honkai: Star Rail.”Soon, his game captures the attention of the entire universe.As players reach the Cocolia boss battle, the song ‘Wildfire’ begins playing.“Woah?! This is a turn-based game; how dare you make it so intense!”“The moment this music kicked in, I felt like I was about to take down an Aeon!”Progressing further, they encounter Dan Heng’s sea-parting scene.“I thought ‘Wildfire’ was intense enough, but there’s even more fire here!”“Dan Heng, still denying you’re Imbibitor Lunae? Now you’re a five-star limited character!”Arriving at Penacony:“Huh? Have you listened to ‘WHITE NIGHT’?”“Acheron’s power has been tested – fellow gamers, feel free to pull for her!”“Duke Inferno: Children, this isn’t funny.”“Before experiencing the story: Aventu**ne? Just another profit-driven fraud! After the storyline: May the Mother Goddess thrice close her eyes upon thee…”“What Aventu**ne?! He’s clearly my unfortunate yet loyal bro!”

She was a famous assassin who had killed important figures, but ironically, she was killed by her own lover.And when she thought she was dead, it turned out she was occupying the soul of a young girl who was tricked by her own family.'Because I have been reborn, I will take revenge on the people who planned my murder and also teach a lesson to the people who underestimated the girl whose soul I reside in!'However, things become complicated when she has to marry a cold man, whom she spent the night with.