There is a sacred place to determine who is the true sister among all younger-sister-esque idols of "Bermuda Triangle"...its name is "True Sister Contest". The champions keep changing, and it had been said that no idol could win the contest twice in a row. Until the girl who enjoyed the title "True Sister" emerged...
One year, "Meer" debuted as a younger-sister-esque idol in "Project Duo", and won the True Sister Contest by a landslide, with overwhelming charming power---"Little Sister power", according to the examiners---that outclassed all other participants.
If that was the only thing, her name would just stay commonly as other winners in the past. Surprisingly...she managed to achieve the unprecedented consecutive victory with her participation in the same contest the year after. To add with, she won the contest two years after, three years after, and to state it clearly, she has won all "True Sister Contests" since her debut.
Now, she has become the first one to be inducted into "the Hall of Fame" of the contest, and has been taking part in the contest not as a contestant, but as the Eternal Sister who presents the trophy to the champion at the end of the contest.
Incidentally, after she had been inducted into the Hall of Fame, she had once been given the task to greet the audience before the contest. As a result, almost all audience had their hearts captured by Meer instead of by the contestants, and the contest ended up with "no champion". This is why she now only enters the stage after the end of the contest when the champion has been decided...perhaps.