Dragon King's Decree

-Daisy Li and Ye Shengja star in both dramas
-Leads work together to change the destiny of the world
-Has romance
-FL has to overcome an obstacle to become stronger

Both MLs are the cold and distant son of the heavenly emperor who is controlling and demanding, raising the ML for a single task. Both FLs are hot tempered and spirited human girls whose identity is swapped with the SFL.

Both MLs are heavenly dragons come down to earth who cross paths with the human FLs. who accidentally takes something powerful that belongs to the ML.

Both MLs are cold dragons who lose something powerful that ends up on/inside the human FL, forcing him to stay with her and leading to them falling in love.

Do Do Hee is the successor of the Future Group. She doesn’t trust in anyone and is cynical about love. Do Do Hee gets involved with a demon named Jung Gu Won and makes a contract marriage with him. He can live for eternity by making dangerous, but sweet deals with humans who endure hellish lives. But after looking down upon humans for 200 years, he gets involved with Do Do Hee and somehow loses his power. To prevent his own extinction, he must protect Do Do Hee who has taken all of his power.