Being a little outdated, just noticed TV2 changed the drama to Rough Justice Chinese drama 十大奇冤. It's starring Dicky Cheung 张卫健. This 2008 drama has a run of 36 episodes. It's a costume period drama about mystery and murder investigation.
Both songs are sung by Dicky Cheung. Opening song 十大奇冤 主题曲-谁是凶手
Ending song 小草与玫瑰－张卫健（十大奇冤片尾曲）
Both videos belong to their respective owners on youtube.