self-delusion
noun [ C or U ] uk/ˌself.dɪˈluː.ʒən/ us/ˌself.dɪˈluː.ʒən/
自欺欺人
the act of allowing yourself to believe something that is not true
It's self-delusion if he thinks he'll be offered a better contract. 要是他认为能签到更好的合同，他就是在自欺欺人了。