'Monday Couple' fans rejoice! Song Ji Hyo will be starring in Gary and Gaeko's upcoming MV.

The song is titled 'Lonely Night' and is described as a healing R&B track. The lyrics are about remembering your family, friends and the people you love after being tired of the modern busy daily life, thus give you the strength to start the day again. It was revealed that Gary made the song after being inspired by the drama 'Misaeng'.

An MV teaser was released today and it immediately attracted much attention thanks to the appearance of actress Song Ji Hyo, since the two are famous as 'Monday Couple' on 'Running Man'. Many people are very looking forward to the full MV.

'Lonely Night' will come out on December 31st while the full music video will be released on January 4th.