expression
Conjunction-like expression used to contrast an unexpected situation with a preceding statement. Often carries a nuance of complaint, surprise, or dissatisfaction. Follows a clause in plain form.
もう春だと言うのに、まだ寒い。
Even though it's already spring, it's still cold.
彼は約束したと言うのに、来なかった。
Despite having promised, he didn't come.