I don't have access to real-time information, and I cannot provide details about specific individuals beyond what is publicly available up to that point. I don't have any information about Seungmin or the specific video you mentioned.
If Seungmin is a public figure, any information about his health or personal choices, such as wearing a particular shirt in a video, would be based on what he chooses to share publicly or what has been reported in the media. Speculating about someone's medical condition without official statements would not be appropriate.
If you're curious about a particular video or event, I recommend searching for more recent information through reliable sources or official statements from the person or their representatives. Additionally, it's essential to respect the privacy of individuals, including public figures, when it comes to their personal health or other matters.