Lee Min Ho
Lee Min Ho and Jun Ji Hyun star together in Legend of the Blue Sea Reuters

Lee Min Ho cannot stop gushing about his The Legend of the Blue Sea co-star Jun Ji Hyun. The 29-year-old South Korean actor has praised the 34-year-old actress' dedication to stay fit and healthy.

In the first episode of SBS's Genuine Entertainment Night, Ji Hyun revealed her secret to slim body, even after having a baby. She said: "I am on a diet...I put a lot of effort into it. The most important thing is to be on guard. It's the most important motivation."

Min Ho added: "She works out in the morning every day. When there's no filming, I need to do nothing to feel well-rested, but Jun Ji Hyun is always working out."

Adding on, during the show Min Ho credited his amazing chemistry with Ji Hyun for the series' victory.

The Legends Of The Blue Sea is Min Ho's first drama in three years. His last TV series was the Heirs which aired in 2013. In the show, Suzy Bae's boyfriend plays a genius conman and the 34-year-old actress reprises the role of a mermaid.

Many fans started speculating that this interview caused rift between Min Ho and Bae. However, despite the rumours, the couple's relationship is going strong. In an interview with Hong Kong magazine New Monday, the Gangnam Blues star was asked whether he has imagined what his married life would be like. He said: "If I get married in the future, I want to have a relationship like friends with my other half. It'd be best if we can communicate often."