I love Ye-in actually, she's probably one of the best FL i seen in awhile. Shes mature and funny but also endearing and easy to tease, she's always been more comfortable around people she's familiar with as she's cold with people she's indifferent too so its not so much her tagging along to be with Woojin but being her most comfortable. Shes aware he hasn't responded to her feelings but isn't pressuring him, she's actually very positive about feeling her own feelings than reciprocal affection. She does get jealous and moody time to time but never to a point of negative/possessiveness, she's very sweet