HONG KONG (Reuters) -TikTok owner ByteDance said on Wednesday that Zhang Nan has resigned as the CEO of Douyin Group, the popular short video platform's sister app in China, while assuming a new role to shepherd ByteDance's video editing app. Zhang, who also uses the English first name Kelly, posted on her personal social media account on WeChat that she was resigning from the position, in a move confirmed by ByteDance. Zhang said she would be joining the team at Jianying, a video editing app owned by ByteDance, but she did not reveal her position at the unit.