Informer

“Informer” is a series that are searched numerously. This manhwa has caught many attentions and can be also referred as “Che Tamja / Chetamja / 體探者 / 체탐자” is published for free on Manhwa Historical

The description of the comics “Informer”:

‘Sejong’s secret weapon, Shadow Unit informer.’
Gwiyoung, called the Ghost’s Shadow, has been wandering around the battlefield since childhood.
Vowing to get revenge, he decided to become a member of the nation’s best special forces as an informer.