Jo Seok graduated from Jeonju University with a major in video cultural studies in 2002, and wanted to infuse an interest in cartoons to those who haven't been fans of graphic novels. Jo began posting The Sound of Heart on Naver Webtoonin September 2006, and by 2014 it was the longest running webtoon on the platform. On December 17, 2015, the 1,000th episode of The Sound of Heart was posted on Naver. Since Jo started posting his webcomic on Naver, views averaged 5 million per update, a total of over 5 billion views. When Jo got married in 2014, he did not have a wedding ceremony or honeymoon trip because he did not want a lapse in his update schedule. In 2015, Jo earned about ₩78,000,000 per month. Jo published other webcomics on Naver Webtoon during the run of The Sound of Heart, such as Jo's Area and Moon You. The Sound of Heart concluded in June 2020, after running for 14 years. Jo said he felt "lucky to be able to feel 'done' with the comic." During its run, the webtoon accumulated nearly 7 billion views and 15 million comments. 500 episodes had been translated into English by the time The Sound of Heart concluded.
Characters
In The Sound of Heart, most characters are based on people in the author's life.
Jo Seok: The author himself in his comic.
Choi Ae-bong: Jo's girlfriend, and, since June 2014, wife.
Jo Joon: Jo's brother.
Jo Cheol-wang: Jo's father. He was a rugby player and owner of a chicken restaurant.
On 7 November 2016, airline carrier Air Seoul announced that it had collaborated with Naver Webtoon to produce pre-flight safety video. Characters from The Sound of Heart were featured in the video, alongside characters from webtoons such as Denma and Noblesse.
had been planning a TV series involving The Sound of Heart since 2015. Lee Kwang-soo was cast to portray Jo Seok, and Jung So-min is cast to portray Choi Ae-bong. The series was also picked up by Netflix and was broadcast on both channels simultaneously on February 24, 2017. Netflix ran another series titled The Sound of Your Heart - Reboot, produced by Kross Pictures. This series began airing in October 2018 and ran for two seasons. In this adaptation, Cho Seok was portrayed by Sung Hoon and Lee Ae-bong was portrayed by Girls' Generation's Kwon Yuri.
Mobile game
Korean mobile game company Neowiz Games produced a mobile video game adaption of The Sound of Heart, launched on Google Play in April 2016. The fee is free and includes some paid item payment features. The latest update is on April 24, 2019 and is a game of RPG personality.
