Kdramas like Happiness?

Hye everyone! I recently got into kdramas and just finished watching happiness. Is there anything similar to it?

I would prefer thriller/zombie but others are fine aswell! I loved the plot and and the dynamic between the two leads, especially the mc. She was sooo cool. I also loved the side characters and the conflicts that arose while they were stuck in there. Looking forward to yalls suggestions!!

A list of dramas I've watched and enjoyed: - All of us are dead - Girl from nowhere - Squid game - Alice in borderland