你是我的未婚妻你是我的未婚夫
[nĭ shì wŏ de wèi hūn qī nĭ shì wŏ de wèi hūn fū]
This straightforward name suggests an engagement between two people. It is used in contexts where someone playfully or seriously wants to refer to a committed romantic relationship indicating that both have decided to get married in the future.