치유 3부작 (Eng: Healing Trilogy) was LADIES' CODE's three-part project that began in February 2016, and ended in March 2018.
The trilogy was supposed to contain three albums, but only has two.
MYST3RY was released on February 24th, 2016. STRANG3R was released on October 13th, 2016. Both albums 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 reflects the fact that there are three living members of LADIES' CODE.
However, in early 2018, Ashley announced that there would not be a third album. Instead, the group's fanmeet CODE#R3BORN, held on March 7th, 2018, their fifth anniversary, would serve as the final part of the trilogy. She later explained that they decided this because they wanted to "release brighter, fast, up-beat songs just like before (like Pretty Pretty and KISS KISS) as soon as possible".
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.