Their management agency HB Entertainment said Sunday that the couple "reached a situation where it is impossible to maintain their married life. After serious discussions, both decided to seek a divorce".
But Ku posted a message on Instagram saying, "My husband, whose feelings have changed because he was bored in the marriage, wants a divorce, but I want to protect our family". The actress also posted messages she exchanged with Ahn, only to delete them a few hours later.
Ku starred in the 2009 hit TV drama "Boys over Flowers" and has since branched out into painting and writing novels. Ahn, a former model, appeared in a couple of successful TV series including the megahit "My Love from the Star".
They met and fell in love while filming a TV drama in 2015 and got married the following year.
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