In the latter months of 2006 when the quartet were busy preparing for their debut album, the youngest member, Aaron Yan, tore a ligament in the knee while filming a dancing shoot for their music video "I Have My Youth". Yan had to be brought to the hospital to do surgery. He was hospitalized for well over three weeks. For four months the other three members of Fahrenheit had to attend to overseas album promotions and functions without the presence of Yan. The Taiwanese media then composed rumors saying that Yan was a disadvantage for the group and that he was dragging the group behind, which would cause disbandment. More rumors surfaced saying that HIM was planning to dispose Yan so Fahrenheit could become a group of three instead of four, therefore complementing more with the prefabricated trio S.H.E. However, Fahrenheit stepped out and confirmed that Yan is still in the group despite his inconvenient condition. To prevent more rumors from happening, as soon as Yan was available he appeared more often in the future promotions with the other members, clearly seen using crutches.

Before Wu Chun's breakthrough performance in the Taiwanese drama Hanazakarino Kimitachihe (Hana-Kimi), most fans considered Jiro Wang as the lead singer due to his memorable performances as the supporting actor, Ah Jin, in It Started With a Kiss and the first male lead, Wang Da Dong, in KO One. Jiro was also granted as the male lead in many of Fahrenheit's endorsement ads and commercials. The paparazzi reported that Jiro was starting to feel overshadowed by Wu because Wu was slated as the first male lead in Hana-Kimi while he was bumped down to the second. The media claimed that Jiro was feeling kicked down and he was not getting the fair share of male leading roles as Wu. (Wu was also the male lead for another Taiwanese drama, Tokyo Juliet.) It was rumored that Jiro was planning to leave Fahrenheit so he could attack Wu's popularity and also focus more on his career alone. After the release of Hana-Kimi, it had become a fact that Wu is not popular among the four; Jiro first due to his often exposure to the media on television and newspapers. Since Wu was also getting more movie and endorsement offers than the other three, it was also reported that Wu was planning to leave the group as well so he could focus more on his personal goals. To cause more controversy, the media reported that Jiro and Wu were also fighting to be the "No. 1" of Fahrenheit and were not getting along. But Fahrenheit quickly stepped out and denied the rumours.

Fans of Calvin Chen and Aaron Yan were beginning to feel that they were getting neglected from the majority. Some fans suggested for Chen and Yan to form their own little duo group aside from Fahrenheit to attack Wu Chun and Jiro Wang's popularity. However the majority of the fans disagreed with this suggestion and replied that they would much rather support Fahrenheit as a whole. To rebuff more similar rumors, Fahrenheit's manager replied to the incident and said that Fahrenheit would not be splitting any time soon because they are currently signed to a five year contract. Wu also spoke and confirmed to the audience that they are still together, saying that although Fahrenheit do have their own offered projects, they will still appear together as a group to album promotions, onstage performances, and other group activities.

In mid-January when the boy band Fahrenheit were guests in the Chinese program, Super Winners (超级大赢家), fans had filed complaints toward the host, Frankie Kao, for his disrespectful and careless attitude towards Fahrenheit and their fans. Fans listed their arguments, criticizing Kao for being contemptuous; before the program was to be recorded Fahrenheit and their fans had to wait for over two hours because Kao had to practice his dance for the opening ; when Aaron Yan had his eyes burnt, Gao completely ignored his injury and continued on with the program. When fans began to worry and cry, he became annoyed and screamed at the fans to shut up. Fans also complained that when Fahrenheit were dancing, Gao had caused them to NG many times and therefore they were required to dance several more times. Fans witnessed an extremely exhausted Jiro Wang, who was almost to the point of collapsing after the dancing. The ill Wu Chun was also a victim; fans had witnessed Gao requiring Wu to do health-risking activities when Wu was sick with a fever.