Both are BL dramas whereby the main character and his love interest initially do not have a properly defined relationship. They have a sort of friend with benefit situation under the guise of the love interest 'helping out' the main character. My Stubborn is a Thai BL drama and Secret Lover is a Taiwanese BL drama.
The similarity in both Never Forget Your Enemy and Secret Lover is that the main couples are childhood friends that turn to lovers. Also, one of the boys secretly keeps girls from approaching his friend by dating them. It started as a requited love then they became boyfriends in their later years after high school.
I found it similar the second I watched the pilot of Friend Benefit, also I have to watch Secret Lover, and I think Jai's character is not red flag as it was shown in the pilot, it probably more like a yellow or orange, he was probably dating those people who were actually Pik suitors, which was exactly what happened in Secret Lover, Tuo had a secret crush on his friend, but he hated with other people who were Jingxi's suitors, that's why we didn't saw anyone confessing him because Tuo was already clearing them away from his best friend, he was possessive, he didn't wanted to share his bsf with anyone, it's the same thing for Jai as well.



