Just yes or no. I don’t want spoilers as to why he did that

Guys i wanna know if the author already laid down why sowoon betrayed yona. Ive marinated this for 5 years and i aint planning to read it yet if they haven’t spill the tea yet.
As a member of the skip beat fan community, ive played this game b4 (๑•ㅂ•)و✧