Kdrama or cdrama where male lead doesn’t want a relationship and is perfectly fine on his own

No hint of romance:

• Bloodhounds (boxer, moneylender, mafia) with upcoming S2
• D.P. (military, suicide, bullying) 2 seasons
• I Am Nobody (comedy, martial artists) 2 seasons
• Medical Examiner Dr. Qin (forensic team, investigation) only watched S1, dropped the sequel with lead actor change
• Under the Skin (police, scetch artist) 2 seasons with hint of S3

Had past romance:

• One Dollar Lawyer (comedy, private detective)
• Seoul Busters (comedy, police) with the possibility of S2

From my PTW, maybe:

• Stranger (police) 2 seasons
• The Trauma Code: Heroes on Call (medical team) 1 season with upcoming S2 and S3
• Three-Body (police, alien)