I'm bored so I might as well list down the things he did that gets him the yearner title MAJOR SPOILERS FROM THE NOVEL
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- LSY agreeing to be experimented because Gayoung mentioned that he'll be able to meet J if he agrees
- LSY's first words being J
- LSY creating a whole guild just to open up rifts and save J
- LSY naming the guild "Pado" (or Waves) in memory of their promise of seeing the sea together
- LSY visiting the sea often in those 5 years when he thinks of J
- LSY always making documentaries about J for 5 years so the entire world will never forget about him
- LSY waiting for 8 years
- LSY putting J first before everything
- When LSY passed out, he specifically instructed Seo Mingi before to go to J immediately in case something happened to him too
- TL2 LSY creating a whole reality just to convince J to forget the world and live with him
- TL2 LSY'S world stopping when J died
- TL2 LSY and LSY fighting because LSY believes that J can't be stopped at what he wants to do (aka saving people)
- TL2 LSY saving J in the West Sea Rift and telling him to live quietly
- LSY also telling J in the West Sea Rift that he can never live quietly and comforts him
- LSY wanting to shackle J to keep him from trouble but deciding that he can never do that. And is happy when he himself is J's shackle in a way (Hesitation)
- LSY always being patient and waiting for J to figure out his own feelings
- LSY always being observant and considerate of J
- LSY spoiling J with his money lol
- LSY having to witness J die again in front of his eyes and preserving his body when they were in the memorial dungeon
- LSY hallucinating J when he died
- LSY being an extra clingy mf when he finds out that J is immune to his poison
- So many kisses... the novel spoils us because everything else is angsty.
- LSY first thought was to feed J when he got out of the memorial dungeon, even when he himself is hungry
- LSY and J fighting because LSY doesn't want J to take responsibility for him just because J saved him
- LSY hates miscommunication and often says what he wants out loud
- LSY describing J as a foolish, lovable person
There's more but that's all I can think of rn lol I'm convinced that if LSY's circumstances are the same as Yoo Joonghyuk, that mf WILL regress countless times just for J

And from that day on, LSY became one of the best yearners in history and he just keeps proving right in the later chapters lol absolute green flag