When South Korean President Park Geun-hye turned to a lawyer known as her "Bulletproof Vest" to defend her in a corruption case that could lead to impeachment and criminal prosecution, she may have had little choice.

Although Yoo Yeong-ha is not among the country's better-known lawyers, he wears his die-hard loyalty to the embattled president as a badge of honor, a rarity for Park as the scandal around her deepens.

A remote figure even at the height of her popularity, Park has now been deserted by many of her allies, including her own justice minister.