I could come up with some , Yoo Ah In for example. Even though Fashion King was probably even worse than The Heirs, he still showed way better acting than Lee Min Ho has ever shown. And in my opinion he's way more handsome. Kim Soo Hyun, another example, Lee Seung Gi - an idol turned actor way better in acting. T.O.P - same situation. Even Lee Joon played better in Gap Dong than LMH ever. Gong Yoo, Jo In Sung, Song Joong Ki, Lee Min Ki, Yoo Seung Ho even Kim Woo Bin. There's a lot. Let's be honest, the reason why LMH is so popular is not because of his excellent acting skills.