心血 (xīn xuè): Painstaking care [lit. with the heart's blood] (Noun) — Meaning & Stroke Order

This novel embodies the writer's lifelong painstaking care and can be called a literary treasure.

Can't you see the painstaking care he has put into this proposal?

The exquisite layout of this garden is by no means the result of painstaking care over just a short period.

To prepare for this exhibition, the curator expended immense painstaking care and energy.