On 29 June 1995, the Sampoong Department Store in Seoul, South Korea, collapsed due to structural failures.
The disaster killed 502 people and injured more than 900. It provoked national outrage as the building's construction was riddled with corruption and malpractice.
Sun Minh Lee was working at the shop that day. She speaks to Ben Henderson.
(Photo: Sampoong Department Store after the collapse. Credit: Choo Youn-Kong/AFP/Getty Images)