Maybe it's a blessing in disguise. 塞翁失马，焉知非福
a blessing in disguise 因祸得福之事
blessing [ˈblɛsɪŋ] n. 福气，幸事；同意；祈祷，祈福
Count your blessings! 谢天谢地！
with the blessing of sb./with sb's blessing 经某人同意
to say a blessing over sth./sb. 为某物/某人祈祷
disguise [dɪsˈɡaɪz] vt. 伪装；掩盖（hide）；n. 伪装
to be disguised as a priest 化妆成牧师
to disguise one's voice 伪装声音
disguise scar/facts/intentions 掩盖伤疤/事实/意图
in disguise 化了妆
to be a master of disguise 善于伪装
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