According to the Samguk sagi, he was the younger brother of the previous king Taejo the Great.
[1] During his brother's reign, Chadae successfully repelled attacks by Han dynasty China, and gained power within the Goguryeo court.
After eliminating opponents, including Go Bok-jang, he eventually received the throne from Taejo, who was probably forced to abdicate[1] in 146.
Following several natural disasters and civil unrest, he was killed by his minister Myeongnim Dap-bu, according to the Samguk sagi.
[4] According to the Samguk yusa, the subsequent king Sindae killed both Chaedae and Taejo.