Sooyoung's sister Choi Soo Jin is currently an actress in the musical, 'Le Passe Muraille,' which also stars Shinhwa's Dongwan.  She appeared on the November 13 installment of SBS's 'One Night of TV Entertainment' and left a sweet, teary message for Sooyoung, who hosts the show.

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Choi Soo Jin sweetly started off with a very loving, "Sooyoung," that also started off the light tears.  She continued, "I feel honored and happy that I got to participate on your show . . . I hope to gain strength and send you a lot of love and happiness.  Fighting!"

This caused Sooyoung to also get a little teary-eyed from her hosting area and she said, "I don't know why my sister is crying," to which her co-host jokingly suggested there must be some background to this.  Sooyoung explained that she is apart from her sister often so Soo Jin may be missing her a lot.

Watch the video above at 2:42 to see this sweet sisterly moment.

Source: OSEN via Nate