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To further retain its hold on the top spot as the most popular Korean drama, the producers of webtoon 'K' released a new original soundtrack.

The OST is titled "My Heart" – a soft and slow ballad track – performed by Jeon Woo Sung of the ballad group Noel. It would be the theme track for the rollercoaster relationship of the characters played by Lee Jong Suk and Han Hyo Joo, reported Koogle.

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The song has a relaxing melody which would give fans of the webtoon perfect vibing with the storyline of the drama that airs at 10 p.m., every Wednesday and Thursday.

‘W’ marks the return of Han Hyo Joo – the current cover girl of Grazia Magazine’s September issue – to TV after six years. When the webtoon started on July 20, the father of Yeon-joo, played by Han Hyo-joo, disappears while writing the last chapter of the webtoon “W.”

When she goes to her father’s office, Yeon-joo found on her father’s monitor Kang Cheol, the character played by Lee Jong-suk, bloodied. She read a note left behind by her father when a hand from the monitor pulled her in and discovered she is on a rooftop of a building, beside a man lying in blood.

After saving him,Yeon-joo realizes it was Kang Cheol whose change in feelings determined when can she leave and enter the webtoon. Latest viewership data say that “W” got a viewership share of 12.3 percent when its 10th episode was aired on Aug. 24.

Two days after the OST was released on YouTube, it had become viral with more than 100,000 views.