A middle-aged man who returns from another world goes back to when he was 17 and becomes unbeatable
ch 35
It Was Just a Contract Marriage
ch 64 https://newtoki467.com/webtoon/34311689/%EA%B3%84%EC%95%BD-%EA%B2%B0%ED%98%BC%EC%9D%BC-%EB%BF%90%EC%9D%B4%EC%97%88%EB%8B%A4?stx=%EB%BF%90%EC%9D%B4%EC%97%88%EB%8B%A4 raws: ch = ch
Toratsuki-Kaicho, Teawase Negaimasu!!
ch 6.5 https://battwo.com/series/136439/toratsuki-kaicho-teawase-negaimasu raws: ch 12
Cry, or Better Yet, Beg
ch 35 https://www.novelcool.com/novel/Cry-Even-Better-if-you-Beg.html https://m.webnovel.com/id/book/cry-even-better-if-you-beg_28141114308085705
The Archduke's Magical Business Partner
ch 31 / 40 https://newtoki467.com/webtoon/40564654/%EC%8B%9C%ED%95%9C%EB%B6%80-%ED%9D%91%EB%A7%89%EC%9D%B4-%EB%82%B4-%ED%8C%8C%ED%98%BC%EC%9D%84-%ED%9B%84%EC%9B%90%ED%95%9C%EB%8B%A4?stx=%ED%9B%84%EC%9B%90%ED%95%9C%EB%8B%A4 raws: ch = ch same, but worse translation: https://www.mangago.me/read-manga/the_terminally_ill_villain_supports_my_broken_engagement/
The Terminally Ill Villain Supports My Broken Engagement
ch 31 / 40 same, but better translation: https://www.mangago.me/read-manga/the_time_limited_black_screen_supports_my_breakup/
Ecchi wa Shuu-7 Kibou desu!