A butterfly-tapping technique (butterfly hug) mentioned by Moon Gang-tae is an actual technique to help patients who experienced trauma and helps with bilateral stimulation to help relax or calm a person.
This is actor Kim Soo-hyun's first lead role in a TV series since he was discharged from the South Korean military on July 1, 2019.
Each episode is named after either a real-life fairy tale or one of Ko Mun Yeong's fairytales from the show.
To prepare for his role as a caregiver, Kim Soo-hyun met an actual caregiver at a ward.
Kim Soo-hyun and Kim Chang-wan were also in My Love from Another Star (2013), as main and supporting roles respectively.