Step 1: Prepare a rectangular piece of paper and fold it in half.
Step 2: Fold in half at the same time.
Step 3: Turn to the reverse side and fold both sides inward.
Step 4: Turn the pen tip to the other side.
Step 5: Fold both sides to the middle.
Step 6: Open Step 5, and fold both ends in half at the crease of the fifth part.
Step 7: Open Step 6: Press it into the shape shown below according to the crease.
Step 8: Turn forward and tilt the two corners outward.
Step 9: Fold the two corners of the crease inward according to step 8, and the heart-shaped bookmark is completed.