Modern drama where the ML is a true gentleman

Like the title ^_^

MLs who are polite, courteous, respectful and honourable: 

• Bromance
• Extraordinary Attorney Woo
• You Are My Glory
• Encounter
• In Time With You
• Because This Is My First Life - Polite but stiff.
• Itaewon Class
• My ID Is Gangnam Beauty
• When the Weather Is Fine

Less polite in the first episode or two, but not awful, and definitely a gentleman later on: 

• Crash Landing on You
• Her Private Life