SPOILERSSSSSSS!!
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In the novel, after his loss; taekjoo makes a few more bets. By each bet, you can say zhenya warms up to taekjoo even buying kimchi for him, and offering anastasia to him (bc zhenya was in a 'sad' mood); eventually taekjoo wins through rock, paper, scissors and obvi wishes to leave the island but knowingg that bastard he obvi didn't let taekjoo go fast-forward a bit; zhenya's sister comes to 'visit' by helicopter and gets to know taekjoo and she feels bad that he's stuck with her brother. Whilst Olga is there (zhenya's sister) zhenya is pressured by his brother Bazim to hand over taekjoo and anastasia. While zhenya is out of the island to attend to work, an ambush happens on his island to get taekjoo, i believe this frustrates him and he asks taekjoo why he keeps running away and eventually tells taekjoo to "leave then" Zhenya tells his sister to leave the island and she unfortunately does. Taekjoo goes to 'help' her with her luggage and suddenly tells her that he owes her? He uses Olga as hostage and uses flammable medicine (i think) as the weapon (he also has a gun, meaning if he shoots the flammable liquid they all ) Zhenya obeys and says "Come here, taekjoo" taekjoo shakes his head and climbs the ladder with both olga and the weapons. They climb the ladder of the helicopter, zhenya forgets taekjoos warning and rushes towards them. Taekjoo throws the nuclear liquid; explosion occurs; zhenyas on the floor. He gets up but the helicopter has already flown away in distance. Since his helicopter was destroyed all he could do was stand there and yell "TAEKJOOOO" and i think he questions their time spent together and becomes sad and lonely once again...
TLDR; Next few chapters will probably be about the other bets taekjoo made with zhenya; eventually Zhenya's sister Olga comes to visit. After a while ust as Olga is about to leave the island; Taekjoo uses this opportunity to help her with her luggage while zhenya is downstairs and uses Olga (and liquids that could blow them up) as hostage to get on the helicopter. Zhenya tries to call Taekjoo bc he thought they had a bond but Taekjoo refuses; gets on; throws the nuclear liquid to stall; and runs away. Zhenya cries out for him in pain and ends up sad and lonely once again.
(Sorry if it's hard to understand, it's been a while since I read the novel...)

So I need to be spoiled, is Zhenya going to turn into a pathetic crying mess once Taekjoo leaves or is it gonna be like this for a while?