Cho Pak was a character who appeared in the Season 7 episode of M*A*S*H titled "The Price". The part of Cho Pak is played in the episode by Yuki Shimoda, who also guest appeared in the episodes "Yessir, That's Our Baby" (Season 8) and "Oh, How We Danced" (Season 9).
About Cho Pak and "Sophie", Colonel Potter's Horse[]
Col. Potter rides back to camp, having spent a near-perfect day out with his horse Sophie. When he makes it back to his tent, he and Radar give the laundry to an elderly Korean gentleman, Cho Pak (Yuki Shimoda) and his daughter Sun (played by Miko Mayama).
Col. Potter is a little concerned over how unhealthy Mr. Pak looks, and suggests he come to the hospital for an exam. Mr. Pak refuses, and his daughter explains he's a proud man - a former cavalry officer - and is not happy to be "reduced" to doing laundry. Col. Potter, an old cavalry man himself, understands.
The next morning, Col. Potter and Radar are shocked to see that Sophie is gone! Col. Potter assumes he left her coral open at the end of the night, and they quickly arrange a massive search to find her.
But all day passes with no luck. Col. Potter grows despondent, coming to grips with the idea he's never going to see Sophie again. He asks Radar to share a drink with him as a toast to "absent friends."
The next morning, Sophie returns to the 4077th, ridden by Mr. Pak, dressed in full military regalia. The daughter explains that her father was once a proud man, and couldn't help claiming Sophie as his own, so he could feel like a young, brave soldier once again. Col. Potter understands this motivation better than anyone, and actually offers to let Mr. Pak keep Sophie. He says that Sophie means the world to him, but, to Mr. Pak, "she means even more."
Mr. Pak's daughter tearfully thanks Col. Potter, and accepts for her father. They turn around and wander off, leaving Col. Potter standing there with Sophie's empty bridle. Radar is stunned at Col. Potter's overwhelming gesture of kindness: "Colonel - that's just about the best thing I ever saw anybody do ever."
The next morning, Mr. Pak's daughter is back, with Sophie. She explains to Col. Potter that her father died over night. But, thanks to Col. Potter, he died with pride and dignity, something she never will forget. She plants a gentle kiss on Col. Potter's cheek, hands him Sophie's lead, and walks off.
BLOOPER: If you look at Sophie when Col. Potter walks her away, her saddle is missing. It was there when the Col. gave him the horse.