STAYC's Sieun showcased her emotional vocals and leadership on Mnet's 'Steel Heart Club.' On the second match of the 4th round, 'Collaboration Unit Battle,' aired on the 2nd, Sieun performed a collaboration stage with Hanbin Kim's team.

As soon as Sieun appeared, the atmosphere in Hanbin Kim's team immediately intensified. Sagisomel said, "When I was serving in the Marine Corps, I always saw STAYC on TV, and it felt like a dream." With Sieun's addition, Hanbin Kim's team secured mass appeal. Sieun introduced the 'Steel Heart' secrets that captivate fans' hearts, including winks and hand kiss gestures, and taught the 'poking dance' from 'ASAP.'

Sieun suggested Younha's 'Event Horizon' as the stage song. Hanbin Kim's team evaluated that it could show a charm different from their previous performances. Sieun harmonized with Sagisomel through ensemble practice, complementing the vocals. She encouraged Sagisomel, who became discouraged due to a mistake, saying, "You must not lose confidence," comforting the members.

The stage featured perfect harmony and vocal blending. Sieun demonstrated an air guitar performance, showing relaxed stage manners.

Meanwhile, STAYC, to which Sieun belongs, is currently holding their second world tour of the year, 'STAY TUNED.' They visited 8 cities in Asia, 4 cities in Oceania, and 10 cities in North America, meeting local fans. On February 11 next year, they will release their first full-length album in Japan, 'STAY ALIVE.'

[Source: Provided by High Up Entertainment]