Who Is the Mourner of Whom in Past and Present Lives?

"If you promise me to grow old together with you in this life, then in the next life you will still be willing to hold hands with me." "I've always known it. I knew it the first time I saw you. You will be a thorn in my side that I will never be able to remove in my life, but despite this sorrow, I... Still enjoy my life so willingly." "Shi'er, please give me your hand in the next life, okay?" A time-traveling woman and three men have no choice but have to choose. . So who is it?