What is Wrong with the Tea?

While everyone else at the dining table was left to wonder why Anton had put two white-like tablets in Ji-yun's cup of tea, Anton had switched the hot beverage of Ji-yun and that of Yanmei. 

"Let me ask you again, Ji-yun? What's wrong with my wife's tea? YOU just poured it in her cup and IT is still warm," repeated Anton. 

Whereas, Yanmei reached for Anton's cup of tea and drank from there. She smiled and said, "Surely. There is nothing wrong with my tea. Go ahead and drink it."

"Anton! What is the meaning of this? You just insulted our daughter. Naturally, she will no longer be willing to drink from Yanmei's tea!" It was Jin-Ae, Ji-yun's mother, who stood up and raised her voice at Anton. 

"What did I do, aunt? I was just showing how one could have easily drugged my wife with any of us knowing. It was a simple presentation," explained Anton with his brows drawn together.