Born with the name Handoko Waradana Sjahrir. Everyone called him by Handoko, in short is Doko. He is the eldest of Sjahrir. He has one younger sister, whose name is Andrea Tatjana Sjahrir. They are about 10 years apart in age. Even though they are quite far apart in age, they seem very close to each other. They often played, joked, and even fought like another siblings as usual.

Handoko was born in Jakarta, July 9, 1989. When he was a child, he was very quiet and didn't talk too much. But, many of his friends like to being around him because of his warm personality. He is a child who doesn’t hesitate to help those in need. His social spirit grew well at a young age. He also loves his family with all his heart. Everything about his family are meant a lot to him.

He is currently busy by being an Indonesian soldier. Even so, despite his busy schedule, he still took the time to contact his family and also fanboying for TWICE. The soldier must be black? SHAAAP. Soldiers can't be white? YES, SHAAAP. Soldiers must be loving Twice 24/7? SHAAP.