Zhang Yiming, CEO of Tiktok, has declared his intention to step down from his role as CEO of the company whose success with TikTok propelled it to the status of the world’s most successful startup.

Zhang Yiming, who is also the CEO of ByteDance, TikTok’s parent company, will leave the company, and fellow co-founder Liang Rubo will take over as CEO. Liang is currently in charge of human resources at ByteDance.

Zhang ruminated on his job and how he believes he will be more successful in another capacity in a lengthy internal letter that ByteDance later made public.

In a lengthy internal letter that ByteDance later made public, Zhang ruminated on his position and how he feels he’d be more effective in another role. Zhang says “I worry I am still relying too much on the ideas I had before starting the company, and haven’t challenged myself by updating those concepts.”

“I think someone else can better drive progress through areas like improved daily management,” he continues. “The truth is, I lack some of the skills that make an ideal manager. I’m more interested in analyzing organizational and market principles, and leveraging these theories to further reduce management work, rather than actually managing people. Similarly, I’m not very social, preferring solitary activities like being online, reading, listening to music, and daydreaming about what may be possible.”