副作用 Side Effect

某天，安妮问了个让我吓一跳的问题：干吗自从病假回来就看来好像闷闷不乐的样子？
她还说不只是她一个人这样认为，其他的安娣级同事也曾经讨论这个话题。大家都认为我生病回来后真个人就静了下来，连笑容也歉缺了。
同一个时间，大家也发现同样患病的发哥却有相反的改变。不但开始微笑地和人打招呼，整个人也开朗很多了。
究竟是什么问题？同样的病却有不同的副作用？

One day, Annie asked a question that stunned me : Why you looked very unhappy since return from the medical leave ?
She also mentioned that she is not the only one that think like this as she over heard other colleagues that sit around her were also discussing the same topic during their chit-chat. Everyone thinks that I had been too silent for weeks and hardly smile like last time.
At the same time, everyone also noticed that the other victim, Lai show an opposite change compared to me. He had started to smile when greet people and looks much cheerful than before.
Still wondering what is the problem ? Why there is different side effect from the same sickness ?