You may read the manhwa version here:
Dokgo : mangapark.net/manga/dokgo
Dokgo 2: mangapark.net/manga/dokgo-2-baek-seung-hoon

You can watch the rest of the drama here:
Episode 1:    • Dokgo Rewind EP 01 (Eng Sub) FULL  
Episode 2:    • Dokgo Rewind EP 02 (Eng Sub FULL)  
Episode 3:    • Dokgo Rewind EP 03 (Eng Sub FULL)  
Episode 4:    • Dokgo Rewind EP 04 (Eng Sub FULL) Fin...  

Cast: EXO Sehun, Gugudan Mina