Male lead with monolid eyes

https://www.soompi.com/article/1458807wpp/monolid-k-drama-actors-who-give-us-butterflies

+ Deng Lun (suddenly remember him)

You could check their dramas.

Wang Rui Chang

• A River Runs Through It 
• Dear Diary 

Qu Chu Xiao 

• Bloody Romance 
• Shining for One Thing 

Cheng Yu Feng 

• Enslaved by Love 
• A Lucid Dream 
• In the Grip of Love 

Li Zhuo Yang  

• Mutual Redemption Love 
• All of Her 

Li Ge Yang 

• Always Have, Always Will 
• Dominion and Devotion 
• Supervisor Husband

Yang Ze 

• Destined to Meet You 
• The Killer Is Also Romantic 

Jang Dong Yoon 

• The Tale of Nokdu 
• My Man Is Cupid

Lee Jun Ho 

• Just Between Lovers 
• The Red Sleeve 
• Confession 

Kasamatsu Show  

• Gannibal 

Off Jumpol

• Not Me