Just when you thought the entire good looking cast was set for upcoming fantasy historical drama 'Moon Lovers', there's more! So if you were on the brink of watching this drama when it airs, we think this casting news will tip you over.

Girls' Generation's Seohyun, as well as actress Kang Han Na have been confirmed to act in 'Moon Lovers' as princesses!

The drama's side stated, "Kang Han Na and Seohyun are confirmed to act, and will transform into fatally attractive princesses."

Seohyun will play the last princess Woohee who is hiding her identity and has become a gisaeng with a motive. Kang Han Na will also play a princess.

The drama stars IU and Lee Jun Ki, and the princes are EXO's Baekhyun, Kang Ha Neul, Hong Jong Hyun, Nam Joo Hyuk and Ji Soo.

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The drama will be entirely pre-produced and is set to air at the second half of this year.