치유 3부작 (Eng: Healing Trilogy) is LADIES' CODE's three-part project that began in February 2016.
The trilogy will contain three albums. Two have been released; MYST3RY and STRANG3R, which both have three songs and contain the number "3" as a replacement for the "E" in their album titles. The albums are accompanied by a triangular logo. It also reflects the fact that there are three living members of LADIES' CODE.
While the name "healing trilogy" can be interpreted as the girls continuing to heal from their accident, Sojung stated that she wants their music to heal the listener. She also described the trilogy as a way to be closer with their fans.