Both series have very similar plot lines between the main characters. Love to hate to inevitable destined love and learning what it means to love. Theory of Love would be PG-13 where as History: Obsessed gets a solid R rating. Both are entertaining with the Theory of Love being more of a RomCom where History:Obssesed is a full on drama.
The plot of two dramas are different, but they both portrays the tension and struggles in the relationship between the 2 male leads. These two stories stand out of the rest of the Thai BLs from GMMTV. The acting and the story made you become vey invested in the characters and want to see what decision they will make in the end.