Question

사우나 가서 마사지 받았어요 -고 is used to list two unrelated actions. The use of the sequential marker -아/어서 implies that two actions are intrinsically linked; the second action commonly wouldn't be possible without performing the first action. -고 can replace -아/어서. However, the use of -어/아서 is preferred whenever there is an intrinsic connection between the two clauses.

Accepted Answer

I went to the sauna and then I had a massage

Front	사우나 가서 마사지 받았어요
Back	I went to the sauna and then I had a massage
Notes	-고 is used to list two unrelated actions. The use of the sequential marker -아/어서 implies that two actions are intrinsically linked; the second action commonly wouldn't be possible without performing the first action. -고 can replace -아/어서. However, the use of -어/아서 is preferred whenever there is an intrinsic connection between the two clauses.

I 고 사우나 가서 마사지 받았어요 Sauna Massage