Yoon Si-yoon said he is 'so emaciated'... with a body fat percentage of 6%, he has started a 24-hour water fast.

Actor Yoon Si-yoon's extreme weight loss efforts for his upcoming project have drawn shock.

On the 22nd, the SBS entertainment show 'My Little Old Boy' (hereafter 'Miwoosae') aired a segment showing the daily life of actor Yoon Si-yoon, known as the 'Alarm King'.

Yoon Si-yoon, who has a body type of 177 cm and 67 kg, surprised the cast with the fact that his body fat percentage is only 6.7%. Seo Jang-hoon remarked, 'That's almost a body without fat.'

Yoon Si-yoon was continuing his extreme body management for the drama 'My Little Old Boy', which starts shooting on the 25th. He revealed, 'I want to give a look that is so emaciated that it leaves a hollow impression, so I am currently undergoing a 24-hour water fast', and footage showed him training all day without consuming a drop of water.

He then attempted intense strength training along with sauna dehydration, even challenging himself with the 'extreme diet' used by boxers for rapid weight loss. Ultimately, Yoon Si-yoon, who lost even moisture, revealed, 'There's no saliva at all,' shocking everyone.

In response, the MCs admired him, saying, 'He is truly a professional,' and 'The determination to go all out for a single role is remarkable,' while viewers expressed their excitement, saying, 'I look forward to Yoon Si-yoon's acting in 'My Little Old Boy'.

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