Na Hee-sun (Korean: 나희선; born 10 December 1986), also known by his online alias Ddotty (도티TV, also spelled as "Dotty") is a South KoreanYouTuber, internet personality and businessman. He is the current president and co-founder of Sandbox Network.[2][3] Na gained fame as an internet celebrity among young audiences through his family-friendly content, which focused mostly on the video game Minecraft.
Na became involved with the 2020 Korean YouTube backdoor advertising controversy when several YouTubers associated with Sandbox Network were revealed to have published videos with advertised content without labeling their videos with tags disclosing paid promotions.[12] On August 7, Sandbxox Network revealed a statement of apology acknowledging the company's responsibility.[13]
On May 2, 2024, Na was prosecuted by KORAIL for trespassing when he posted a video of himself inside an operational railroad in Yongsan District, Seoul, on Instagram. The video was later taken down, and Sandbox Network released a statement of apology, elaborating that the railroad was mistaken as defunct.[14][15]