In the latest episode of the drama "That Winter, The Wind Blows" showed results stating that actor Jo In Sung and actress Song Hye Kyo are siblings.

In the 4th episode of the SBS Wednesday and Thursday drama "That Winter, The Wind Blows," that aired on February 20th, Oh Young (Song Hye Kyo) and Oh Soo (Jo In Sung) seemed to becoming extremely close to each other.

In the third episode, Moon Hee Sun (Jung Eun Ji) tried to switch Oh Soo's toothbrush in place of the one that Lee Myung Ho (Kim Young Hoon) took out. Myung Ho quickly found out that the bags have been switched and started looking for the filed bag.

During the DNA examination, the results showed that Oh Young and Oh Soo are 99% related to each other as siblings. This was because Park Jin Sung (Kim Bum), who Hee Sun and Myung Ho kicked out already switched the bags once before Hee Sun switched the bags.

The researching center told Myung Ho, "the results show that they have an absolutely high chance of being siblings, but there was something weird," and it left viewers wondering if they will find out that Oh Soo is not her real brother.