After the Moosical concert, all the Mamamoo members are tired except for Solar who kept looking at Moonbyul while thinking about what happened during the concert and what is she trying to do when she face Moonbyul .. After they all reached their apartment, they parted .. Wheein with Hwasa going to the second floor , and Solar with Moonbyul going to the first floor .. In the elevator , Solar is quiet on the outside while in the inside she was talking to herself .. After a while, she was shocked that there's a familiar hand that touched the center of her back .. she flinched when she heard Moonbyul asked ' Excuse me.. Are you going to sleep here tonight? I've been waiting for you, Unnie' .. 'Ah! Sorry! I was too tired. Okay, let's go' while they was still walking to their own apartment, Solar talk to herself again, ' 'unnie' yes, she considered me as her unnie .. Damn yongsun, don't ever think to ruin your sisterhood relation' without thinking too much anymore, she speak , ' Moonbyul! ' Moonbyul turned to Solar and said 'Hm?' , Solar retorted , ' Do you mind if you sleep at my place or I sleep at your place, I mean, I just wanted to be with you tonight .. No no! I just don't want to be alone .. At least, not tonight. ' and Moonbyul easily said ' sure .. at my place . Shall we? '