I completed watching Perfect Marriage Revenge and read Marry My husband webtoon. So story-wise similarity is huge, let me point out
1. FL's husband is a cheater and cheats with FL's close one.
2. FL dies after finding out the truth
3. FL comes back from death to take revenge
4. ML has a secret crush on FL but couldn't confess before
5. ML also dies and gets a second chance
6. FL has been bullied since childhood.