30 Years Have Passed Since the Prologue - Chapter 157

The cold wind howls across the Northern Wilderness, and Louis Calvin tightens his wolfskin cloak, standing alone atop an ice cliff.As the son of a Duke, he was thrown into this perpetually frozen wilderness under the guise of 'pioneering glory.'When he thought he was at a dead end, the Daily Intelligence System activated:[Thirty-seven ice-bound hungry wolves are lurking in the southeastern valley, planning a raid on the territory tonight.][At dawn, an Ancient God's corpse will emerge from the Ice Lake, with its heart retaining the godliness of winter.][The Church of Gold Finch will deem you a blasphemer, and the Holy Flame Knight Order has set out on a northern expedition.][A tide of the undead will sweep across the continent, with humanity's numbers dwindling to less than a million.]...

[If you enter the deep forest, you will be eaten by the shadows.

The shadows of the forest move when a person is not looking.

There is a shadow that mimics people in the deep forest.

The shadow of the forest speaks.]

Rosaline, of the Knights of the White Night, had gone missing after being attacked by enemy forces during a hunting contest.

However, she was found unconscious, badly injured, and lying beneath the cliff.

Rosaline, who woke up a few days later, seemed to have severe memory loss. It was difficult for her to speak even simple words.

She was found walking barefoot, in her pajamas, talking informally here and there. She would even pick up food off the floor!

She’s a strange girl no matter how you look at her. Is that really Rosaline?

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

The MC entered the body of the An family eldest son, An Ziran, an arrogant 16 years old boy who weighed 78 kg (~171-172 lbs), who only knew how to eat, play and sleep. Seeing his current body, An Ziran decided his first priority was to LOSE WEIGHT!