I regressed and became the Sword Ice King - Chapter 305 - - Festival 36- The System Uprisers plans

A huge guy is bawling his eyes out. In this day and age? Sure, maybe the world changed while I was away in that other place. I’m not some old-fashioned boomer.But what if that guy is clinging to my pant leg, sobbing and sniffling—And we’re not even acquaintances?Even in modern times, that’s just messed up. Ask any passing kid, they’d agree.So yeah, I shook my leg. He was gross and too close.“The hell’s wrong with you? Crying just ’cause you saw a ghost?” “N-no! I swear, it was really there! You didn’t see it!!”I let the disrespect slide. Barely. He was asking for help and still talking down to me just because I look young?Obviously, I’m not the one who lost his balls. He is.And yet… when I looked where he pointed—Something was there.I threw some coarse salt and looked again.He stared at me like I was insane, but I ignored it.…Yeah. Something was definitely there.It made eye contact.

When he woke up, Lin You found that the world had changed drastically.

Monsters of all races roar and bombard wildly, field magic cards form a deep sea out of thin air, royal tombs, skyscrapers, and trap cards are infinitely possible.

Duellist colleges and universities all over the country are rising, and the miracle secret realm is full of dangers.

This is a world where all people chase cards, and the era of card duelists shines.

- Description from novelbuddy

An ordinary (?) grandfather, Choi Chuntaek. In an effort to protect his granddaughter, he started the virtual reality game 'Arkstar.'

Then... he accidentally obtained a legendary class?

Ron finds himself reborn in the world of One Piece, stranded on a remote island in the East Blue. But he's not just any ordinary child—he’s bonded to a mysterious sign-in system that grants him powers with every new location he visits.At his first sign-in, he unlocks the legendary Sun Breathing Technique, along with a boost to his vitality. From Shitmotsuki Village to Skypiea, Enies Lobby to Marineford, Ron travels the world, collecting extraordinary rewards that make him a force to be reckoned with. The Raikiri, one of the 21 Great Grade Swords, Armament Haki, Observation Haki, and more fall into his hands.As Ron steps onto the battlefield of Marineford during the legendary Summit War, the mightiest warriors—Four Emperors and Marine Admirals alike—pause, stunned by his presence. But Ron merely waves them off, “Don’t mind me. I’m just passing through.”Join Ron on his journey across the Grand Line as he signs in at iconic locations, growing stronger with every step. This is not just an adventure—it’s a legend in the making.