毅然
firmly; resolutely; without hesitation
依然如故
back to where we were (idiom); absolutely no improvement; Things haven't changed at all.
依然故我
to be one's old self (idiom); to be unchanged; (derog.) to be stuck in one's ways
怡然自得
happy and content (idiom)
毅然决然
without hesitation; resolutely; firmly