Manhwa's the Korean version of Manga, which became more popular in the West after Solo Leveling got a lot of scanilations. The comics tend towards vertical strip format, and usually follow a weekly schedule, with seasons that range from 30-50 strips followed by an off season. They tend to frontload the first chapters, and have a tendency to get shorter/more filler as they go because of the faster production pace. (By comparison, most Manga is monthly)

Here's some of my picks:

Reincarnation of the Suicidal Battle God is exactly what it says on the tin, with a corrupt religion that matches the gods, who oversaw an apocalypse and rewound it to get more entertainment from the failed hero, who sets out to dominate once he's regressed.

Revenge of the Iron Blooded Sword Hound is thematically dark, and focuses on a discarded 'hound' who regresses after being betrayed by his family, House Baskerville. The MC's focus on revenge drives him to excel, but he changes enough of the future that his treatment changes as well.

The World After the End Has outstanding art, which carries an otherwise bog standard tower story until the twist hits-- I can't vouch for the third arc, but the first two are worth reading just for that twist between the two. Best art I've seen in any medium for a while.

Kill the Hero is a regression story that follows the natural consequence of dungeons upending the world-- the people who clear them become heroes, who get corrupted by the power and leverage over everything they gain by being saviors. Villain names his guild 'Messiah' and is stone-cold evil under the mask. The MC regresses and abuses all his knowledge to 'Kill the Hero.' Rivals Overlord and Solo Leveling in its depiction of Necromancy.

Return of the Frozen Player is a story with return in the title, which uses a defrosting from cryostasis rather than regression as its plot mechanic. One of earth's five heroes who was frozen and presumed dead after clearing the 'final dungeon' revives. Recommended for the villains-- the fiends, who drink the blood of demons and earn every beating the MC dispenses.

Past Life Returner gets an honorable mention. It's a remake of one of the older regression stories, and the MC straight up seeks to monopolize wealth to combat & control an oncoming dungeon apocalypse. The dungeons themselves are the brutality here, because electricity and guns don't work. The MC is exactly as ruthless as he needs to be to survive in that environment.