Performance 4 is considered a "death" round when requiring the Assigned Roots to maintain their form in a state of prolonged tension, while also facing Thailand's top boy band.
After minhtin had to stop and the two members Ho Dong Quan and Swan Nguyen temporarily "frozen", the group's spirit was seriously affected. Many contestants such as Cuong Bach and Swan Nguyen continuously have health problems, have to take care of medical care and are absent from practice sessions. Head of Duy Lan admitted that the whole team was "burn out" after a tight schedule and a series of consecutive performances.

Performance 4 consists of two rounds: the Bamboo Breaking round and the main competition round with two performances Dance Battle and Performance. In this episode, the group opposite the international group BUS from Thailand - a 12-member band that is well-trained and has many outstanding achievements. BUS opened with a score of 829 - the highest score ever, creating great pressure for Vietnamese rookies when they had to overcome to rescue the two members who were frozen.
Realizing that the group spirit was going downhill, the Executive Producer of SOOBIN went directly to the studio to rectify. He frankly said that the practice spirit was disjointed and warned the contestants not to be subjective: "Whoever thinks he is sure of a debut should reconsider". To test the will, SOOBIN offers a psychological challenge: anyone who feels unable to resist can step out of the room. The moment Duc Duy advanced shocked the whole group, but this contestant affirmed that it was an act of determination to continue, not a desire to leave the competition.
As a leader for the first time, Duy Lan was under great pressure when he had to lead the group in the context of declining spirit. SOOBIN evaluates Duy Lan as a "soft leader" type (soft leader in a soft direction), using calmness to connect members but sometimes lacking rigidity. After receiving comments from the producer, Duy Lan adjusted, reorganized the group and strengthened the consensus.
Episode 9 ended with a tense atmosphere when rookies were forced to turn pressure into motivation to pass the most important round of performances.