My world to Free-use - Chapter 1: The beginning begins with a slap

Waking up, Kim Hajin finds himself in a familiar world but an unfamiliar body.

After 50 years of being in the position of Hwacheon Clan Leader, Kang-hyuk, widely renowned as 'The Dragon' retires.

System: You are now a lowly male supporting role, a passerby who wants to go offline at any time, please keep secretly and grow vulgarly.
Shi Yan: Very good, thank you for your suggestion.
The first world: Shi Yan, as a little prince born in a cold palace, made himself an emperor.
The original male and female protagonists, under his witness, became grudge couples.
The second world: Shi Yan, as the youngest son of the princess who died tragically, made himself a powerful minister over ten thousand people.
The original male and female protagonists, under his witness, became grudge couples.
The nth world: Shi Yan, as a genius in the world of comprehension, has made himself the number one powerhouse in the Three Realms.
The original male and female protagonists, under his witness, became grudge couples.
The system feels that something is wrong.
Shi Yan instead persuaded him: Let the male and female protagonists come together in the end no matter what the circumstances are, isn’t it the self-cultivation of the tool man and the male partner?

Content tags: Kuaichuan Shuangwen Metaphysics
Search keywords: Protagonist: Shi Yan ┃ Supporting role: ┃ Others:
One sentence introduction: The male partner is beautiful alone
Purpose: strong heart, unmoved by wind and rain

- Description from novelbuddy

At six, Jiang Huai stubbornly clung to the thighs of the fairy in white and wouldn’t let go. She took him back to the mountain and made him her only direct disciple.At fifteen, he changed his way of addressing his master from ‘mother’ to ‘sister,’ and after being severely beaten, he corrected himself to ‘Master’. Jiang Huai harbored a grudge in his heart for a full six years.At twenty-one, he learned how to talk back to his master.