One-line summary: Come live at my place. It's free.
Quan Suixin gets a laid-back landlord System and, overnight, becomes the owner of a seven-story apartment building. That's all there is to it: she just has to fill the rooms, and make sure all the tenants find a happy ending. Then her merit will be complete.
As for what the tenants want, well, it's supposed to be laid-back, so she can decide for herself.
Naturally, Quan Suixin chooses to sit back, eat, and wait for the good times to roll.
Unfortunately, there are just so many scumbags getting in her way. She has no choice but to smack them down one by one and kick off the satisfying power fantasy!
The heroine looks sweet and gentle, but inside she's tough as nails.
The hero is the sort who digs a hole when she kills someone and adds fuel to the fire when she sets things ablaze. He's a willing accomplice who helps the wicked do evil. He can't help it; he just wants to spoil her like this.