Song Deok-ho began acting in 2015, first appearing in the short film The Road to School. He next played small roles in several films and TV series such as the acclaimed psychological thriller Burning in 2018 and the tvN dark fantasy Hotel del Luna in 2019. In 2021, he began to take more significant roles such as in Netflix’s military drama D.P. and in the KBS2 sageuk Moonshine. He was also cast in the 2021 movies Sprinter and What Happened to Mr. Cha. In 2022, he became part of Wavve’s Tracer and tvN’s Link: Eat, Love, Kill. Later that year, he joined Hyeri and Jun in MBC’s fantasy-romance May I Help You.
Song Deok-ho attended Dongguk University’s theater department.