On April 9, 2017, the Sunday Evening Service was offered up as District, Sub-district, and Cell Leaders' Devotional Service 2017. The devotees consist of 1,670 district, sub-district, and cell leaders under the leadership of the Guidance Pastor Rev. Soojin Lee. They are from Grand Parishes 1, 2, and 3 which are divided by districts: the Chinese Parish (Korean Chinese and Chinese), the Foreigners' Parish (foreign members living in Korea).

In the GCN's live broadcasting, the service was presided by Elder Enoch S. Lee, President of Male Cell Leaders' Association. Elder Honggi Park, President of Male District Leaders' Association offered up representative prayer, and Senior Deaconess Jaenam Jeon read the reading passage.

Dr. Lee preached the message "Sincere Heart" based on Hebrews 10:22. He urged attendees not to be dishonest, not to have a changing mind, and not to seek their own benefits in order to achieve a sincere heart and lead many souls to salvation.

They made up their minds to cast off dishonesty in heart, a changing mind, and to seek the glory of God and others' benefits to accomplish a sincere heart quickly.