User blog:Mgf60/Vol.1 Ch.71 Naver Endnote translation explanation

Original korean:  16년간 뒤통수만 연구해오신 잠어 유한성 선생님께서..

16년간 = 16 years

뒤통수만 = The back of the head

연구해오신 = Have been researching (with two deferential suffixes attached)

잠어 = Sleep (Subject)

유한성 = Yu Han Sung

선생님께서 = [...] given to |the teacher/teacher [...]|, because... (Formal language is used)

With the most literal translation it would be "Sleep is given to teacher Yu Han Sung, because he has been researching the back of the head for 16 years.

SIU is referencing a common korean idiom here, which is "뒤통수치다" meaning "To strike the back of someone's head". This idiom is equivalent to "stabbing someone in the back", so to betray them. This means that when Yu Han Sung is "researching the back of the head" he is planning to betray someone ("Scheming").

This leads to the more accurate translation of:

Sleep is given to teacher Yu Han Sung, because he has been scheming for 16 years...

(TN: This is also said with deference, but this is difficult to convey in the translation.)