Sunny’s home is Gil Raim’s home in Secret Garden. It is located near Dongdaemun, be prepared to climb a lot if you go there. (It was really scary on my way back looking down the slope…). The metro station of left lower corner is Dongdaemun station and you can start from exit 1-3, last time I started from exit 1 and walked up.
Sunny’s second BBQ chicken is located near Cheonggyecheon. It is close to 4 metro stations, closest way is exit 12 of Jongak station in the left upper corner of the map above. What a coincidence that I have also been here before with friends, more than a year ago haha.